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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3de90697a9038b42bb9c82810488c1134516cb270623f07940e49a673620a835' 
  AND token = 'gWY6oVg33lQNhWD1jS94jwg9IvNXsaRPwwbqs0aaB7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}